Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fe23df7d34ea1433de9a12384fc4a5b070e92fe78e6183187c9f41e4fefc64' 
  AND token = 'pl5NS+BFLgesPzIWxMh/s5Sp0WTMXl1kAlDlxGMB9tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}